Hi there ~
I understand your concerns. I am very sorry to hear that you chose to shoot up crystal methamphetamine
and you now have thrombophlebitis
which is inflammation of the vein into which you injected. I believe there was also some amount of blood oozing out of the blood vessel causing bruise
like area which is red and yellow in color. It will heal in a few days, however you need to make sure that the area is not infected, and consult a local doctor about the same. Applying local antibiotics and analgesics may help but systemic ones are more effective. I wish you the best in recovery and hope you do not try these drugs again.
I hope this helps. Take care and have a lovely day!